Fuse plug



A. BRUNNER FUSE PLUG Nov. 25 1924- Filed July 31, 192

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ATTORNEY Patented Nov. 25, 1924.

UNITED STATES ARTHUR BR-UNNER, or SAN FRANCISCO, CALIFORNIA.

' FUSE PLUG.

Application filed July 31, 1922. Serial No. 578,686.

T 0 all whom it may Concern:

Be it known that Ami-run BnUNNnR, a citizen of the United States of l lmerica, residing at 1058 Ellis Street, San Francisco, in the county of San Francisco and State 01" California, has invented certain new andv useful IHIPIOVG-IHGDtS in Fuse Plugs, of which the following is a specification.

The present invention is an improved tuse plug.

The objects of the invention include;

(1) The provision of a fuse plug for electrical circuits such as interior house wiring, which is so constructed that when one fuse has been destroyed byan overload of current others are available without the necessity of substituting another plug.

(2) The provision of a plug having a plurality 0t fuses radially disposed about the center of the plug and insulated one from the other to prevent arcing or short cireuiting of the current, and arranged in such a manner that the various fuses may be successively rotated to contact with a fixed contact and thereby close a circuit.

(3) The production of a multiple tuse plug which will afford a maximum amount of service at a minimum cost.

In this specification and the annexed drawings, the invention is illustrated in the form considered to be the best, but it is to be understood that the invention is not limited to such term, because it may be embodied in other forms, and it is also to be understood that in and by the claim tollmving the description it is desired to cover the invention in 'Wl'mtever form it may be embodied.

in the accompanying one sheet 01 drawings, Figure 1 is a vertical transverse section of my improved fuse plug;

Fig. 2 is a horizontal section taken on the line II II of Fig. 1;

Fig. 3 is a bottom plan view of a porcelain sleeve member Fig. 4 is a top plan view of Fig. 1;

Fig. 5 is a plan view of a washer member;

Fig. 6 is a central cross section of Fig. 5;

Fig. 7 is a perspective view of a fuse clip or terminal.

Referring to the drawings, the numeral 1 indicates a cylindrical plug member of a suitable insulative material. such as porcelain.

The plug enlarged at the closed end and serrated as indicated at 2 to facilitate the rotation of the plug when it is desired to screw it into a socket. The plug 1 is provided with a central recess 3. A band 4 of sheet metal. is helically threaded and one end oi. this band is embedded in or attached to the porcelain plug 1, while the opposite end protrudes to engage a lamp socket (not shown) in the usual manner.

A. strip 6 of metal is soldered to the inner wall of the threaded metal member 4 and extended downwardly in the recess 3 to a point near the bottom.

At 7 I show a bushing member the exterior walls of which are serrated as shown at 8 to form longitudinal ribs 9 on the periphery of the bushing.

The inner wall of the bushing 7 is grooved longitudinally as shown at 11 to form channels for fuse wires 12.

These channels are closed as shown in Fig. 2 when a tubular member 13 is inserted in the bushing 7.

That end of bushing 7 which extends into the plug 1 is slotted radially as indicated at 1 1, Fig. 3.

The purpose of these slots is to engage and hold in radial arrangement spring clips 16 secured to the wires 12, Fig. 7. V

In the drawings I have shown wires for fuses but, obviously, flat or other metal might be used.

It will be seen that in assembling my plug the wires 12 are laid in the grooves 11 with the flattened clips 16 in the several adial slots 14:. The tubular member 13 is inserted and this closes grooves 11.

An insulating washer 17 covers the end o l' the member 13, and is Of a diameter suiticient to engage the flat clip members 16 and prevent them from leaving the radial grooves 141.

At the end of member 13 remote from the plug 1, a washer 18 of conductive material covers the ends of the fuse wires 12 and these wires are pressed into engagement with a washer 21 of conductive material. This washer lies in a recess 22 of the outermost end of bushing 7.

The parts are securely held together by a screw 23 extending axially through the washers 17 and 18 and through the member 13. A nut 24 of conductive material holds Y the parts together and serves as a contact lid 24 passes through washer 18 and wire 12 to the contact 6 which is connected to the metal .member 4:.

Should the wire 12 be fused by an overload, the bushing may be rotated until the nextadjacent rib 9 is engaged by the armate contact strip 6. This operation'may be repeated until all of the Wires 12 are exhausted.

When all of the wires 12 are used, the parts may be dismembered and new ones insert-ed at small cost and very little effort.

I claim A fuse plug comprising two concentric cylindrical members of insulating material. an electrical terminal centrally disposed with respect to the inner of said members. an electrical. terminal peripherally disposed with respect to the outer of said members, a series of grooves between said members, fusible conductors in said grooves, said. conductors all electrically connected to one terminal of the plug, and each provided with a spring clip adapted to independently contact a conductor from the other terminal of the plug when in register therefor.

In testimony whereof I affix my signature.

ARTHUR- BRUNXIGR. 

